EP0923224A2 - Verfahren und Vorrichtung zur Bildverarbeitung - Google Patents

Verfahren und Vorrichtung zur Bildverarbeitung Download PDF

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Publication number
EP0923224A2
EP0923224A2 EP98122842A EP98122842A EP0923224A2 EP 0923224 A2 EP0923224 A2 EP 0923224A2 EP 98122842 A EP98122842 A EP 98122842A EP 98122842 A EP98122842 A EP 98122842A EP 0923224 A2 EP0923224 A2 EP 0923224A2
Authority
EP
European Patent Office
Prior art keywords
image processing
width
original
processing apparatus
image data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98122842A
Other languages
English (en)
French (fr)
Other versions
EP0923224A3 (de
Inventor
Nakatani c/o Canon K.K. Akihiko
Yamamoto c/o Canon K.K. Tadashi
Kaneko c/o Canon K.K. Kiyoshi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0923224A2 publication Critical patent/EP0923224A2/de
Publication of EP0923224A3 publication Critical patent/EP0923224A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H04N1/126—Arrangements for the main scanning
    • H04N1/128—Arrangements for the main scanning using a scanning head arranged for linear reciprocating motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
    • H04N1/1911—Simultaneously or substantially simultaneously scanning picture elements on more than one main scanning line, e.g. scanning in swaths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
    • H04N2201/0414—Scanning an image in a series of overlapping zones

Definitions

  • the present invention relates to image processing apparatuses, image processing methods, and recording media which effect high-quality images.
  • a conventional image processing apparatus usually receives data from a computer and records on a recording sheet by a recording head according to the received data.
  • some image processing apparatuses are provided with a function for reading an original by a scanner unit in addition to a recording function.
  • either a recording head or a scanner unit can be mounted on a carriage and both recording function and original reading function can be used with a recording-sheet conveying system being shared.
  • a recording head for a recording method such as a dot-matrix, thermal transfer, or an ink jet type is detachably mounted on the carriage and moved along a recording sheet by moving means for recording.
  • the recording head is removed from the carriage, a scanner unit is mounted thereon, and the scanner unit is moved along the original for reading it.
  • one-path reading is performed to read one band with the use of a green light source in a monochrome scanner unit.
  • reading is performed sequentially with the use of red, green, and blue light sources to read one band, the original is fed by the one-band width, and then this operation is repeated until the area to be read in the original which the user has specified is completely read.
  • an object of the present invention to provide an image processing apparatus, an image processing method, and a recording medium which effect a high-quality image.
  • an image processing apparatus including: reading means for reading an original at a predetermined reading width in the main scanning direction; controlling means for controlling such that the reading means and the original move relative to each other in the main scanning direction and the sub scanning direction, the reading means reads the original at the predetermined reading width while the reading means and the original move relative to each other in the sub scanning direction, then the reading means and the original move relative to each other in the main scanning direction at a width smaller than the predetermined reading width, and the reading means reads the original at the predetermined reading width while the reading means and the original move relative to each other in the sub scanning direction; and image processing means for applying predetermined image processing to the image data of the original read by the reading means.
  • an image processing method including: a controlling step of controlling such that reading means for reading an original at a predetermined reading width in the main scanning direction and the original move relative to each other in the main scanning direction and the sub scanning direction, the reading means reads the original at the predetermined reading width while the reading means and the original move relative to each other in the sub scanning direction, then the reading means and the original move relative to each other in the main scanning direction at a width smaller than the predetermined reading width, and the reading means reads the original at the predetermined reading width while the reading means and the original move relative to each other in the sub scanning direction; and an image processing step of applying predetermined image processing to the image data of the original read by the reading means.
  • an image processing apparatus on which recording means for recording on a recording sheet and original reading means for reading the original at a predetermined reading width are detachably mounted, including: original feeding means for feeding the original at a feed width smaller than the predetermined reading width; and image processing means for applying image processing to each image data included in at least each portion at which the preceding read section and the current read section overlap.
  • an image processing method which includes a recording step of recording on a recording sheet and an original reading step for reading the original at a predetermined reading width, including: an original feeding step of feeding the original at a feed width smaller than the predetermined reading width; and an image processing step of applying image processing to each image data included in at least each portion at which the preceding read section and the current read section overlap.
  • a storage medium storing a program including a recording module for recording on a recording sheet and an original reading module for reading the original at a predetermined reading width, wherein a program is stored including: an original feeding module for feeding the original at a feed width smaller than the predetermined reading width; and an image processing module for applying image processing to each image data included in at least each portion at which the preceding read section and the current read section overlap.
  • Fig. 1 is a perspective view of an image processing apparatus according to an embodiment of the present invention.
  • the image processing apparatus serves as an ink-jet recording apparatus 50.
  • the ink-jet recording apparatus 50 includes a controller 5, described later, which controls the entire ink-jet recording apparatus 50, a calculation control section 8, and a memory 25 which stores a control program executed by the controller 5 and the calculation control section 8, as shown in Fig. 3.
  • the memory 25 may be configured by a hard disk or a non-volatile ROM.
  • a scanner unit 111 (original reading means, reading means) for reading an image is mounted on a carriage 102.
  • the scanner unit 111 can be replaced with a recording head 101 (recording means, not shown) for recording on a recording sheet with ink.
  • the carriage 102 is moved along the shaft of a platen 106 (original feeding means) for holding a recording sheet or an original to be read, by the use of a driving belt 104 driven by a carriage motor 103.
  • the carriage 102 is guided by two parallel guide shafts 105A and 105B.
  • the recording head 101 When the recording head 101 is mounted on the carriage 102, an image or a character is recorded on a recording sheet placed on the platen 106.
  • the scanner unit 111 When the scanner unit 111 is mounted on the carriage 102, the original to be read which is placed on the platen 106 is scanned and read while the scanner unit 111 is moved in the direction of the shaft of the platen 106 along the original.
  • Fig. 2 shows the structure of the scanner unit 111 shown in Fig. 1.
  • the scanner unit 111 has a casing 115 having a substantially rectangular-parallelepiped shape. Inside the casing 115, an electric circuit board 112 is mounted inside the casing 115.
  • the electric circuit board 112 is provided with an LED 113 which emits light onto an original 110 placed on the platen 106, a photosensor 114 which applies photoelectric conversion to light reflected from a character or image on the original 110, a mirror 116, a field lens 117, an imaging lens 118, a rod lens 119, main components, such as an image processing compensation IC 120, for circuit control, A/D conversion, and image processing, and other electric components (not shown) such as a resistor, capacitor, coil, and oscillator.
  • main components such as an image processing compensation IC 120, for circuit control, A/D conversion, and image processing, and other electric components (not shown) such as a resistor, capacitor, coil, and oscillator.
  • Image data processed by the image processing compensation IC 120 is sent to the ink-jet recording apparatus 50, and then transmitted to a host computer 11 shown in Fig. 3.
  • Fig. 3 shows the entire structure of the ink-jet recording apparatus 50.
  • the ink-jet recording apparatus 50 shown in Fig. 3 is provided with the scanner unit 111 on the carriage 102 shown in Fig. 1 and connected to the host computer 11.
  • the ink-jet recording apparatus 50 is provided with the carriage 102 (shown in Fig. 1) for mounting the scanner unit 111 or a recording head (not shown), a head connection section 2 included in the carriage 102 for connecting to the scanner unit 111 or the recording head, the carriage motor 103 for driving the carriage 102 horizontally, a motor driver 7 for controlling the operation of the carriage motor 103, a line feed motor 14 for rotating the cylindrical platen 106 (shown in Fig. 1), a motor driver 6 for controlling the operation of the line feed motor 14, and a sensor 9 which determines whether a recording sheet for image recording or an original from which an image is to be read is set, and in addition, whether the carriage is disposed at the home position.
  • the ink-jet recording apparatus 50 is also provided with an interface 10 for connecting to the host computer 11, the memory 25 for storing a control program, printing fonts, image data received from the scanner unit 111, and image data received from the host computer 11, and the controller 5.
  • the motor drivers 6 and 7, the sensor 9, the interface 10, and the memory 25 are connected to the controller 5.
  • the head connection section 2 is also connected to the controller 5 through a head connecting line 3.
  • the controller 5 controls the carriage motor 103 and the line feed motor 14 through the motor drivers 6 and 7 and also controls the sensor 9, which determines whether a recording sheet or an original from which an image is to be read is set on a sheet stand (not shown) and whether the carriage 102 is disposed at the start position, by the use of the control program stored in the memory 25.
  • the scanner unit 111 includes a LED 113, a photosensor 114, an amplifier 121 for amplifying the signal detected by the photosensor 114, an analog/digital (hereinafter called A/D) converter 122 for applying A/D conversion to the signal amplified by the amplifier 121, and the image processing compensation IC 120.
  • A/D analog/digital
  • the controller 5 receives character or image record data from the host computer 11 through the interface 10.
  • the record data is received under control of the host computer 11 and the calculation control section 8.
  • the controller 5 processes the received record data so as to record the data on a recording sheet using the recording head.
  • the controller 5 transmits the record data to the recording head through the head connecting line 3 and the head connection section 2 under control of the calculation control section 8, and records the transmitted record data onto a recording sheet using the recording head.
  • the platen 106 (shown in Fig. 1) is rotated by the driving of the line feed motor 14 controlled by the calculation control section 8, the controller 5, and the motor driver 6 so that a recording sheet placed on the platen 106 is conveyed in the direction of this rotation.
  • the platen 106 also serves as a record stand for holding a recording sheet when ink is blown from the recording head to the recording sheet.
  • the carriage 102 (shown in Fig. 1) holds the recording head and carries it along the recording sheet during recording.
  • the carriage 102 holds the scanner unit 111 and carries it along the original from which an image is to be read during image reading.
  • the carriage 102 is moved along the shaft of the platen 106 by the rotation of the carriage motor 103 controlled by the calculation control section 8, the controller 5, and the motor driver 7.
  • the scanner unit 111 is mounted on the carriage 102 and the original from which an image is to be read is scanned along the shaft of the platen 106.
  • the LED 113 emits a light beam to the original.
  • the photosensor 114 having a photoelectric conversion characteristic detects a light beam reflected by a character or an image included in the original and converts the amplified signal to an electric signal.
  • the signal detected by the photosensor 114 is amplified by the amplifier 121 and sent to the A/D converter 122.
  • the A/D converter 122 A/D-converts the signal amplified by the amplifier 121 and transmits it to the image processing compensation IC 120 as digital data.
  • the image processing compensation IC 120 applies image processing such as shading compensation and binarization to the digital data and sends the data to the controller 5 as image data.
  • the image data is sent to the host computer 11 through a path reverse to that used for record data during recording.
  • the image data is transmitted to the host computer 11 from the image processing compensation IC 120 through the head connection section 2, the head connecting line 3, the controller 5, and the interface 10.
  • the controller 5 changes the image data received from the image processing compensation IC 120 to that having a form easy to send at the interface 10 or easy to process by the host computer 11, and transmits the data to the host computer 11 under control of the calculation control section 8.
  • the platen 106 is rotated by the driving of the line feed motor 14 controlled by the calculation control section 8, the controller 5, and the motor driver 6 so that a recording sheet placed on the platen 106 is conveyed in the direction of this rotation.
  • the platen 106 also serves as a record stand for holding an original from which an image is to be read when the original is scanned by the scanner unit.
  • the carriage 102 holds the scanner unit 111 and carries it along the surface of the original from which an image is to be read.
  • the scanner unit 111 reads the image as the carriage 102 is moved along the shaft of the platen 106 by the rotation of the carriage motor 103, as controlled by the calculation control section 8, the controller 5, and the motor driver 7.
  • the sensor 9 determines whether the original to be read is placed on the sheet stand (not shown) and whether the carriage 102 is disposed at the start position.
  • a method is described in which the scanner unit 111 reads the original and applies image processing to the band read from the original.
  • a series of image processing descried below is executed by control of the controller 5 and the calculation control section 8 according to the control program stored in the memory 25.
  • Fig. 4 shows bands read by the scanner unit 111 shown in Fig. 1.
  • Fig. 5 shows a portion in the bands read by the scanner unit, at which overlap reading is performed.
  • the left end of each band is actually located at the same position, it is shown, for simplicity, with a right shift so that the left end of each band does not overlap with each other.
  • the scanner unit 111 To read an original using the scanner unit 111, the scanner unit 111 is mounted on the carriage 102. The original is read in the direction in which the carriage 102 is moved. In a conventional method, when one band is completely read, the original is fed by a reading width, namely, one band width. And then the same operation is repeated to read one original. In monochrome reading, a green lamp is turned on to read the original. In full-color reading, a red (R) lamp, a green (G) lamp, and a blue (B) lamp are sequentially turned on to read the original.
  • R red
  • G green
  • B blue
  • the original when the current band is completely read, the original is fed by half the width of the band.
  • the next band is read, the lower half of the current band is overlappingly read.
  • the band data of the lower half of the current band is stored in the memory 25 until the next band is read and averaging processing, described later, is finished for the overlappingly read band data.
  • the memory 25 is a RAM or a hard disk provided for the ink-jet recording apparatus 50 in the present embodiment.
  • monochrome reading overlappingly read band data for one color is temporarily stored.
  • color reading overlappingly read band data for three colors is temporarily stored.
  • the k-th band red (R) data is read at a width of 128 pixels as shown in Fig. 5
  • the k-th band blue (B) data is read at a width of 128 pixels
  • averaging processing is applied to the band data R1, G1, and B1, and the band data R2, G2, and B2.
  • the data obtained by this averaging processing is called band data R0, G0, and B0.
  • a memory area occupied by the band data for the lower half of the K-th band, for which averaging processing has been finished, is released and at the same time band data for the lower half of the (k+1)-th band is stored in that memory area. Since the area of the memory 25 in which band data is stored is used in this way as a ring buffer, the entire processing is smoothly performed.
  • the band data R0 (R1 + R2)/2 .
  • the band data G0 (G1 + G2)/2
  • the band data B0 (B1 + B2)/2 .
  • the data to which averaging processing has been applied through this series of operations namely, the band data R0, G0, and B0, is used as the data obtained by reading the original.
  • This averaging processing is repeatedly applied to the data of the area to be read in the original to form the whole data obtained by reading the original.
  • the noise level of an image is reduced by about 3 dB as compared with a case in which the averaging processing is not applied.
  • the noise level of an image is reduced by 10 times Log(n) when overlap reading is performed n times. Therefore, when overlap reading is performed the required number of times, a high-quality image is obtained which has a reduced noise level.
  • Fig. 6 shows in detail a control program stored in the memory 25 and executed by the controller 5 and the calculation control section 8.
  • step S61 It is first determined whether or not the scanner unit 111 performs color reading (step S61). When color reading is not performed, the procedure jumps to a step S63, described later. When color reading is performed, it is determined whether or not band data for three colors, red (R), green (G), and blue (B) has been read (step S62).
  • step S71 When the band data for the three colors has been read, the procedure jumps to a step S71, described later.
  • the original is read for one band (step S63) and the band data for this band is stored in the memory 25 (step S64).
  • Fine reading refers to overlap reading of band data.
  • the user can specify fine reading through the ink-jet recording apparatus 50 or the host computer 11.
  • step S65 When fine reading is not performed in the step S65, the procedure jumps to a step S70, described later.
  • fine reading is performed, either averaging processing or function processing is selected as a processing method for the band data after fine reading (step S66)
  • step S66 When averaging processing is selected in the step S66, the averaging processing described above is applied to the band data obtained by fine reading (step S67).
  • step S68 When function processing is selected, the function processing which is described later is applied to the band data obtained by fine reading (step S68).
  • the function processing may be set such that a grade of fine reading is specified according to he type of the function to be used.
  • Figs. 7A shows band unevenness in a case in which fine reading is not performed
  • Fig. 7B shows band unevenness and functions for the band unevenness in a case in which fine reading is performed.
  • Band data R0 to which the function processing is applied is obtained by an equation (1).
  • R0 R1 x f1(coordinate m) + R2 x f2(coordinate m)
  • Such functions include a linear function and (1 - linear function), and the square cosine function and the square sine function.
  • the equation (1) may be weighted according to the nature of band unevenness.
  • the functions f1(coordinate m) and f2(coordinate m) may satisfy the condition, f1(coordinate m) + f2(coordinate m) ⁇ 1 .
  • the noise level is reduced according the function used.
  • the user can specify the grade of fine reading in advance through the ink-jet recording apparatus 50 or the host computer 11.
  • the band data to which the averaging processing has been applied in the step S67 or the band data to which the function processing has been applied in the step S68 is stored in the memory 25 for processing of the next band data (step S69).
  • step S70 the band data stored in the memory 25 is transmitted to the host computer 11 (step S70) It is then determined whether the specified area of the original has been read (step S71). When the specified area has been read, the processing is ended. When the specified area has not yet been read, it is determined whether fine reading is being performed (step S72).
  • step S72 When it is determined in the step S72 that fine reading is being performed, the original is fed by half the band width (step S73) and the procedure returns to the step S61. When fine reading is not being performed, the original is fed by one band width (step S74) and the procedure returns to the step S61.
  • band data is overlappingly read and the averaging processing or function processing is applied to the band data at an overlapped portion, band unevenness is eliminated and a high-quality image is obtained.
  • the averaging processing for band data at half the band width has been described in detail.
  • the present invention can also be applied to a case, for example, in which band data at the lower 1/x (x indicates a real number more than 1) of the current band is overlappingly read and averaging processing is applied to the band data at a width of a 1/x band.
  • the average value of overlapped band data needs to be obtained.
  • the band data R0 (R1 + R2 + R3)/3 .
  • the ink-jet recording apparatus has been described in detail.
  • the present invention can also be applied to a recording apparatus which uses a dot-matrix recording head or a thermal transfer recording head.
  • the scanner unit 111 is moved in the main scanning direction to read the secured original.
  • the original may be moved in the main scanning direction with the scanner unit 111 being secured.
  • the original is moved in the sub scanning direction so as to overlappingly read band data.
  • the scanner unit 111 may be moved in the sub scanning direction with the original being secured, to overlappingly read band data.
  • an original is fed at a distance of the upper half band width of the current band.
  • the current band at the lower half band width is overlappingly read.
  • the band data at the lower half band width of the current band is stored in a memory, and the next band is read. Averaging processing or function processing is applied to the band data which has been overlappingly read.
EP98122842A 1997-12-10 1998-12-01 Verfahren und Vorrichtung zur Bildverarbeitung Withdrawn EP0923224A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP35639097 1997-12-10
JP35639097 1997-12-10

Publications (2)

Publication Number Publication Date
EP0923224A2 true EP0923224A2 (de) 1999-06-16
EP0923224A3 EP0923224A3 (de) 2002-03-13

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EP98122842A Withdrawn EP0923224A3 (de) 1997-12-10 1998-12-01 Verfahren und Vorrichtung zur Bildverarbeitung

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US (1) US6658170B1 (de)
EP (1) EP0923224A3 (de)
CN (1) CN1219713A (de)
TW (1) TW399186B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4617240B2 (ja) * 2005-10-28 2011-01-19 キヤノン株式会社 印刷制御装置、印刷制御方法、プログラム、及び記憶媒体
JP5328505B2 (ja) * 2009-06-18 2013-10-30 キヤノン株式会社 画像処理装置および画像処理方法
JP6420530B2 (ja) 2013-06-26 2018-11-07 キヤノン株式会社 情報処理装置、計測システム、制御システム、光量決定方法、プログラム及び記憶媒体
JP6144976B2 (ja) 2013-06-26 2017-06-07 キヤノン株式会社 情報処理装置、組み付け装置、情報処理方法、及びプログラム
JP6660119B2 (ja) 2015-08-07 2020-03-04 キヤノン株式会社 情報処理装置、情報処理方法、並びにプログラム

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EP0641115A1 (de) * 1993-08-30 1995-03-01 Hewlett-Packard Company Bildabtastkopf für einen thermischen Tintenstrahldrucker
EP0744860A1 (de) * 1995-05-24 1996-11-27 Canon Kabushiki Kaisha Bildlese- und Bildaufzeichnungsgerät

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JP3098576B2 (ja) * 1991-07-05 2000-10-16 キヤノン株式会社 画像入出力装置
US5291240A (en) * 1992-10-27 1994-03-01 Anvik Corporation Nonlinearity-compensated large-area patterning system
JPH0879529A (ja) * 1994-09-07 1996-03-22 Rohm Co Ltd 画像処理装置
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Publication number Priority date Publication date Assignee Title
US4692812A (en) * 1985-03-26 1987-09-08 Kabushiki Kaisha Toshiba Picture image reader
EP0431774A2 (de) * 1989-11-17 1991-06-12 Xerox Corporation Abtaster mit Bildkontextverarbeitung bei langsamer Abtastung
EP0641115A1 (de) * 1993-08-30 1995-03-01 Hewlett-Packard Company Bildabtastkopf für einen thermischen Tintenstrahldrucker
EP0744860A1 (de) * 1995-05-24 1996-11-27 Canon Kabushiki Kaisha Bildlese- und Bildaufzeichnungsgerät

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TW399186B (en) 2000-07-21
EP0923224A3 (de) 2002-03-13
CN1219713A (zh) 1999-06-16
US6658170B1 (en) 2003-12-02

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